Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 66, NWS Boston/Norton, MA

July 13, 2011Bristol County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 13, 2011, 6:21 PM EDT for Bristol County, Massachusetts. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 13, 2011, 6:21 PM EDT (22:21 UTC)
Expired: Jul 13, 2011, 6:48 PM EDT
In force: 27 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

County Bristol County, MA

The radar

The Boston radar (KBOX), 42 km from the middle of the area, began a volume at 22:24 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 10.4 hours before the alert went out and 85 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 8 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 1378 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

839 
WUUS51 KBOX 132221
SVRBOX
MAC005-132300-
/O.NEW.KBOX.SV.W.0066.110713T2221Z-110713T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
621 PM EDT WED JUL 13 2011

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL BRISTOL COUNTY IN SOUTHEAST MASSACHUSETTS...
  THIS INCLUDES THE CITY OF FALL RIVER...

* UNTIL 700 PM EDT

* AT 619 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  WESTPORT...OR NEAR NEW BEDFORD...AND WAS MOVING SOUTHEAST AT 25
  MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...DARTMOUTH.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT LIGHTNING WAS
OCCURRING WITH THIS STORM. GET INDOORS OR INSIDE A VEHICLE NOW! DO
NOT SEEK SHELTER UNDER TREES. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 4151 7101 4169 7115 4177 7109 4160 7092
      4159 7092 4160 7091 4157 7093 4155 7093
TIME...MOT...LOC 2221Z 297DEG 20KT 4165 7099

$$

FRANK

2 follow-up statements

252 
WWUS51 KBOX 132231
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
631 PM EDT WED JUL 13 2011

MAC005-132300-
/O.CON.KBOX.SV.W.0066.000000T0000Z-110713T2300Z/
BRISTOL MA-
631 PM EDT WED JUL 13 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR SOUTHEASTERN BRISTOL COUNTY IN SOUTHEAST MASSACHUSETTS...

AT 629 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR DARTMOUTH...OR NEAR NEW BEDFORD...MOVING SOUTHEAST AT 25
MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4154 7099 4164 7103 4168 7100 4160 7092
      4159 7092 4160 7091 4157 7093 4155 7093
TIME...MOT...LOC 2231Z 297DEG 20KT 4162 7092

$$

FRANK

159 
WWUS51 KBOX 132248
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
648 PM EDT WED JUL 13 2011

MAC005-132258-
/O.CAN.KBOX.SV.W.0066.000000T0000Z-110713T2300Z/
BRISTOL MA-
648 PM EDT WED JUL 13 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BRISTOL COUNTY IN
SOUTHEAST MASSACHUSETTS IS CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND MOVED 
SOUTHEAST OF THE REGION.  THEREFORE...THE SEVERE THUNDERSTORM 
WARNING HAS BEEN CANCELLED.

LAT...LON 4154 7099 4164 7103 4168 7100 4160 7092
      4159 7092 4160 7091 4157 7093 4155 7093
TIME...MOT...LOC 2248Z 297DEG 20KT 4158 7081

$$

FRANK

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 13, 4:39 PM EDT	Special Weather Statement	BOX	Norfolk	51 min
Jul 13, 5:12 PM EDT	Special Weather Statement	BOX	Plymouth	48 min
Jul 13, 5:26 PM EDT	Special Weather Statement	BOX	Bristol	49 min
Jul 13, 5:28 PM EDT	Areal Flood Advisory	BOX	Bristol, Plymouth	78 min
Jul 13, 5:45 PM EDT	Special Weather Statement	BOX	Plymouth	45 min
Jul 13, 5:48 PM EDT	Special Weather Statement	BOX	Bristol	42 min
Jul 13, 5:51 PM EDT	Special Marine Warning	BOX		54 min
Jul 13, 5:57 PM EDT	Special Weather Statement	BOX	Plymouth	63 min
Jul 13, 6:02 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Plymouth	43 min
Jul 13, 6:10 PM EDT	Areal Flood Advisory	BOX	Bristol, Franklin, Hampden, Hampshire, Plymouth	13 days
Jul 13, 6:16 PM EDT	Special Weather Statement	BOX	Bristol	44 min
Jul 13, 6:19 PM EDT	Special Weather Statement	BOX	Franklin	56 min
Jul 13, 6:23 PM EDT	Special Marine Warning	BOX		67 min
Jul 13, 6:44 PM EDT	Special Weather Statement	BOX	Dukes	46 min
Jul 13, 7:24 PM EDT	Special Weather Statement	BOX	Dukes	66 min
Jul 13, 7:27 PM EDT	Special Marine Warning	BOX		63 min
Jul 13, 7:44 PM EDT	Special Marine Warning	BOX		61 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.